Measurement of specimen dimensions and dynamic pressure in dynamic triaxial experiments

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3271538· OSTI ID:22051130

Kabir, Md E ^[1]; Chen, Weinong W ^[1]

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1. School of Aeronautics/Astronautics, Purdue University, 701 West Stadium Avenue, West Lafayette, Indiana 47907-2045 (United States)

Novel experimental techniques are developed to measure the rapid changes in specimen dimensions during dynamic triaxial experiments. A capacitance gage is designed and constructed to measure the diameter change of the specimen inside the pressure chamber at both low and high rates. The length change is determined by a linear variable differential transformer at low rates and by Kolsky bar signals at high rates. The Kolsky bar also measures the dynamic axial stress in the specimen during the high-rate phase of an experiment. A line pressure gage records the hydrostatic pressure in the chamber. The dynamic pressure variation in the chamber during axial impact loading is detected by a manganin gage placed inside the chamber. The feasibility of this new experimental setup is demonstrated by dynamic triaxial experiments on a fine dry sand.

• OSTI ID: 22051130
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 12 Vol. 80; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CAPACITANCE
LENGTH
LOADING
MANGANIN
MEASURING METHODS
PRESSURE GAGES
PRESSURE MEASUREMENT
SAND
SENSORS
SIGNALS
STRESSES
TRANSFORMERS
VARIATIONS